Walk behind lawn mower



FIG. 1 is a perspective view of a walk behind lawn mower;

FIG. 2 is a top view of a walk behind lawn mower;

FIG. 3 is a right side view of a walk behind lawn mower;

FIG. 4 is a left side view of a walk behind lawn mower;

FIG. 5 is a front end view of a walk behind lawn mower; and,

FIG. 6 is a rear end view of a walk behind lawn mower. 

The ornamental design for a walk behind lawn mower, as shown. 